Mac....see below...taken from wikipedia
Not all pavement sealcoat are created equal. For example, refined tar-based sealer offers the best protecting against water penetration and chemical resistance. Asphalt-based sealer typically offers poor protection against environmental chemical and harsher climates (salt water). Petroleum-based sealer offer protection against water and chemicals somewhere between the other two sealers. Another difference between coatings is in terms of wear. Again, refined tar-based sealer offers the best wear characteristics (typically 3–5 years) while asphalt-based sealer may last 1–3 years. Petroleum-based sealer falls between refined tar and asphalt.
Being a fellow Floridian, I hope you can learn from my mistakes.
I had a professional asphalt company seal my lot last year. Apparently, they used an asphalt based sealer and any where I had runoff or pooling from my IBA the sealer started to lift and flake off. This happened with in weeks of application.
Just an FYI.....